Can-seam.



PATENTED SEPT. 18, 1906.

J. A. STEWARD.

G AN SEAM. APPLICATION FILED NOV. 8. 1905.

l' had therein to t tions assembled. Fi

uNrTnn STATES Specification of Letters Patent.

Patented sept. 18,1906.

Application filed November 8, 1905. Serial No. 286,408. 4

To all whom t may concern:

B e it known that I, JOHN A. STEWARD, a citizen of the United States, residing at Rutland, in the county of Rutland, State of Vermont, have invented certain new and useful Improvements in Can-Scams, of which the following is a spleciiication, reference being e accompanying drawings.

This invention relates to a can-seam, and particularly to a structure wherein the central portion of the seam is interlocked,while the opposite ends thereof are provided with overlapping portions extending beyond the o interloc ed jomt, so as to rovide only two walls at the lapped ends, wliich may be readily outwardly burred or bent without danger of injuring the seam and to which the canhead is secured by a double-seamed joint.

The invention has for an object to provide a construction of seam in which the interlockin portions intermediate of the ends thereo are inset, so as to provideextended la -ilanges at each end, which make an abso utely secure joint when soldered and one which 'may be bent outwardly to support the lcan-head to be double-seamed therewith.

Other and further objects and advantages of the invention will be hereinafter fully set forth and the novel features thereof defined by the appended claims.

In the drawings, Figure 1 is a side elevation of a can having this invention applied thereto. Fig. 2 is a detail enlarged elevation of the blank. Fig. 3 is a top view of this blank with the bent interlocking portions shown by dotted lines. Fig. 4 is an elevation of the blank with the interlocking por- 5 is a horizontal section on the line 5 5, F1 4. Fi 6 is a detail vertical section on the e 7 7, ig. 1, before the double-seaming of the can-head with the ,side wall. Fig. 7 is a similar view when double-seamed. Fig. 8 is a detail edge view of the can-blank before assembling, and Fig. 9 is a similar view after assembling.

Like gures of reference denote like parts throughout the several views of the drawm s. .l

v gIhe numeral 1 designates the body or side wall of a can, which is preferably formed of a single piece of -material, the opposite free A 'ends of which are to be joined together. For

'the p ose of forming this seam or joint an -interloc g portion 2 is lprovided by means of an inward lout or. notc 3 at the opposite sides of the interlocking portion, so as to separa-te it from the opposite end portions 4, which form the lapplng joints. This notch may be of any desired shape-for instance,

V shape, as shown in Fig. 2-and the free PATENT OFFIOE. Y

edge 2 is bent inwardly upon the dottedline 5, so as to lie inthe position shown by'dotted lines 6 in' Fig. 2, thus providin a four-Walled interlocked seam at the centra portion of the' joint and an overlapped seam at the opposite end portions thereof. The interlocking portion is inset for a material distance from the free edge of the lapping portion when folded upon the line 5, so as to provide an extended lap for practically the entire width of the interlocked seam and a joint capable of burring or bending outwardly, as shown at 7 in Fig. 6, to form a horizontal support for the canhead 8, the flange 9 of which is provided with a suitable lining 10, which when doubleseamed, as shown in Fig. 7, provides means for securin the head to the can without solder and effects an absolutely tight joint at that point. In the formation of this joint the free ends of the side wall 1, as shown in Fig. 8, are interlocked, as shown in Fig. 9, and a broad overlapping joint formed at each end thereof. This overlapping joint extended materially beyond the interlocking portion is-an essentialand important featureof construction in order to permit the formation of the outwardly bent or burred portion for the reception of the head without breaking or splitting the soldered joint at that polnt, and by the use of a blank, as shown 1n Fig. 2, the can may beformed without the necessity of cutting away any of the material by simply notching the same inwardly vat the proper points and bending the interlocking portion back from the -base of said notches, so as to leave the lap portion at the opposite ends extended beyond such interlocking portion. This greatly reduces the expense of manufacture and prevents the great loss in cans which are cracked and rendered unfit for use in seaming and often when inadvertently seamed permlt leakage of the canby not havingla properly-extended lap portion upon whic the can-head may be secured.

Having now described my invention and set forth its merits, what I claim, and desire to secure by Letters Patent, is-

1. A can-body having a seam comprising interlocked ortions inset the Width of the seam from t e edges of the body, and overlapping extensions at the ends of the interroo IIO

locked portions lying in a uniform smiioth plane vwith the body of the can and outwardly disposed relative to and at a distance beyond said interlooked portions equal to the Width thereof.

2. A can-body having an interlooked seam 1o being outwardly flanged at an` angle, and a upon said body and lap-flanges and seamed therewith-substantially as spcied. In testimony whereof I amy sigmature` 1n presence of two Witnesses.

y JOHN A. STEWARD. Witnesses:

C. H. HARRISON, H. F. KING'SL'EY. 

